NEW YORK (WABC) -- The website for a major player in the investment industry struggled Monday, after news of a significant plummet on the U.S. stock market -- but the company took action to get it back on track.

Vanguard's website, vanguard.com, intermittently gave users a "this webpage is not available" error after login information is entered into the site.

Vanguard hosts investment portfolios for customers, which includes mutual funds, 401(k) and IRAs.

Linda Wolohan, a spokeswoman for Vanguard, said there was a surge of traffic Monday morning.

"We experienced a brief period of sporadic website inaccessibility at the start of the trading day. We've added capacity to manage the volume," Wolohan said. "During this brief period, clients had the option to call to conduct transactions or check balances. Or they're calling merely for reassurance."